Spin-On Oil Filter, with Top Nut. Chrome

With top nut for easy removal with a hex wrench. With 5-micron filtering media. Custom replacement for 637988-99A. Note: This filter is no longer advised for M8 models as of 2020. The Factory introduced a new filter; with a larger (elongated) body; and added 25% filtering media surface area to better support the higher oil flow in M8 models. For M8 specific oil filters see 920966 chrome; 920967 black; 920968 chrome with top nut and 920969 for black with top nut.

Fitment: 1999 Softail; 99-17 Twin Cam; 17-20 M8 (NU)

Suitable where the listed fitment matches.